CVE-2026-68473
Description
A flaw was found in the Linux kernel's powerpc/uaccess component. The mask_user_address() function incorrectly checks for CONFIG_E500 instead of CONFIG_PPC_E500. This error prevents the mask_user_address_isel() function from being used on PowerPC E500 hardware, which could lead to improper handling of user addresses and potentially impact system security or stability.
Statement
This vulnerability is rated as a Moderate impact because exploitation requires local access and is confined to systems operating on PowerPC E500 processor architecture. Red Hat Enterprise Linux is not impacted as it does not ship support for this legacy embedded platform, nor does it include the flawed upstream kernel changes. As a result, standard enterprise environments face no operational exposure.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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